Media Contacts: Annick Robinson Investor Contacts: Justin Holko (438) (908)

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1 News Release FOR IMMEDIATE RELEASE Media Contacts: Annick Robinson Investor Contacts: Justin Holko (438) (908) Merck's HPV Vaccine, GARDASIL 9, now available in Canada Helps Protect Against Nine HPV types Including Types that Cause About 90% of Cervical Cancer Cases Kirkland, Quebec- April 1, Merck(NYSE: MRK), known as MSD outside the United States and Canada, announced today that GARDASIL 9 (Human Papillomavirus 9-valent Vaccine, Recombinant), Merck s 9-valent human papillomavirus (HPV) vaccine, is now available in Canada. GARDASIL 9 is indicated for use in girls and women 9 to 45 years of age for the prevention of cervical, vulvar, vaginal, and anal cancers caused by HPV types 16, 18, 31, 33, 45, 52 and 58, pre-cancerous or dysplastic lesions caused by HPV types 6, 11, 16, 18, 31, 33, 45, 52, and 58, and genital warts caused by HPV types 6 and 11. GARDASIL 9 is also approved for use in boys and men 9 to 26 years of age for the prevention of anal cancer caused by HPV types 16, 18, 31, 33, 45, 52 and 58, precancerous or dysplastic lesions caused by HPV types 6, 11, 16, 18, 31, 33, 45, 52 and 58, and genital warts caused by HPV types 6 and 11. GARDASIL 9 is contraindicated in individuals with hypersensitivity, including after a previous dose of GARDASIL 9 or GARDASIL [Quadrivalent Human Papillomavirus (Types 6, 11, 16, 18) Recombinant Vaccine]. With GARDASIL 9, the medical and public health community now has the potential to help prevent 90 percent of cervical cancers caused by HPV, said Chirfi Guindo, President and Managing Director Merck Canada. This is an extraordinary opportunity to even further reduce the burden of HPV-related diseases and cancers in males and females in Canada. The human papillomavirus (HPV) is the most common sexually transmitted infection in Canada and worldwide. It is estimated that 75% of sexually active Canadian men and women will have at least one anogenital HPV infection in their lifetime, explained Dr. Vivien Brown, Family Doctor and Board Member of Immunize Canada. Vaccination remains the best method to prevent HPV infection and to protect yourself from the risk of HPV-related diseases.

2 - 2 - GARDASIL 9 includes the greatest number of HPV types in any available HPV vaccine. After HPV types 16 and 18, the five additional HPV types in GARDASIL 9 are the most common cervical cancer-causing types worldwide. The nine HPV types in GARDASIL 9 (HPV 6, 11, 16, 18, 31, 33, 45, 52 and 58) cause approximately 90 percent of cervical cancer cases and approximately percent of high-grade cervical lesions (cervical precancers, defined as CIN 2, CIN 3 and AIS) worldwide. These seven HPV types also cause percent of HPVrelated vulvar cancers, percent of HPV-related vaginal cancers, and percent of HPV-related anal cancers. HPV types 6 and 11 cause approximately 90 percent of genital warts cases. In addition, approximately percent of cases of low-grade cervical lesions (CIN 1) are caused by the nine HPV types included in the vaccine. In clinical studies, GARDASIL 9 demonstrated high efficacy against the five additional HPV types The clinical trial program for GARDASIL 9 was designed to build upon the efficacy established in clinical trials with GARDASIL [Quadrivalent Human Papillomavirus (Types 6, 11, 16, 18) Recombinant Vaccine]. The initial clinical program that supported the licensure of GARDASIL 9 began in 2007 and included six trials that evaluated more than 12,000 individuals who received GARDASIL 9. The efficacy of GARDASIL 9 in 16- through 26-year-old girls and women was assessed in an active comparator-controlled, double-blind, randomized clinical trial (Study 1) that included a total of 14,204 women (GARDASIL 9 = 7,099; GARDASIL = 7,105) who were enrolled and vaccinated without pre-screening for the presence of HPV infection. Participants were followed up with a median duration of 40 months (range 0 to 64 months) after the last vaccination. The primary comparison between GARDASIL 9 and GARDASIL was clinical efficacy for the five additional HPV types. Effectiveness of GARDASIL 9 against persistent infection and disease related to the original four HPV types (6, 11, 16, or 18) was inferred from non-inferiority comparisons. The primary efficacy analysis was conducted in those who received all three doses of vaccine within one year of enrollment, did not have major deviations from the study protocol, were negative (PCR negative and seronegative) to the relevant HPV type(s) prior to dose 1, and who remained PCR negative to the relevant HPV type(s) through Month 7 (perprotocol efficacy, or PPE, population).

3 - 3 - The primary efficacy evaluation was based on a composite clinical endpoint of HPV 31-, 33-, 45-, 52-, and 58-related cervical, vulvar, and vaginal cancer, and high-grade cervical/vulvar/vaginal disease [CIN 2/3 (cervical intraepithelial neoplasia 2/3) or AIS (adenocarcinoma in situ), VIN 2/3 (vulvar intraepithelial neoplasia 2/3), and VaIN 2/3 (vaginal intraepithelial neoplasia 2/3)]. Additional secondary endpoints related to HPV 31, 33, 45, 52, and 58 were also evaluated. Efficacy for all endpoints was measured starting after the Month 7 visit. In the PPE population, GARDASIL 9 (Human Papillomavirus 9-valent Vaccine, Recombinant) demonstrated: 96.7 percent efficacy (95% CI; 80.9, 99.8) against the combined incidence of cervical, vaginal, and vulvar cancers, CIN 2/3, AIS, VIN 2/3, and VaIN 2/3 caused by HPV types 31, 33, 45, 52, 58 (1 case in the group that received GARDASIL 9 vs. 30 cases in the group that received GARDASIL ) percent efficacy (95% CI; 92.4, 99.9) against CIN 1 caused by HPV types 31, 33, 45, 52, 58 (1 case in the group that received GARDASIL 9 vs. 69 cases in the group that received GARDASIL ) percent efficacy (95% CI; 79.5, 99.8) against CIN 2/3 or AIS caused by HPV types 31, 33, 45, 52, 58 (1 case in the group that received GARDASIL 9 vs. 27 cases in the group that received GARDASIL ) percent efficacy (95% CI; 61.5, 99.7) against vulvar or vaginal disease caused by HPV types 31, 33, 45, 52, 58 (1 case in the group that received GARDASIL 9 vs. 16 cases in the group that received GARDASIL ) percent efficacy (95% CI; 94.4, 97.2) against persistent HPV infection 6 months or longer with HPV types 31, 33, 45, 52, 58 (35 cases in the group that received GARDASIL 9 vs. 810 cases in the group that received GARDASIL ) percent efficacy (95% CI; 94.4, 97.7) against persistent HPV infection 12 months or longer with HPV types 31, 33, 45, 52, 58 (21 cases in the group that received GARDASIL 9 vs. 544 cases in the group that received GARDASIL ) percent efficacy (95% CI; 89.7, 94.8) against abnormal Pap tests (ASC-US HR- HPV positive or worse) caused by HPV types 31, 33, 45, 52, 58 (35 cases in the group that received GARDASIL 9 vs. 462 cases in the group that received GARDASIL ) percent efficacy (95% CI; 93.6, 98.6) against biopsy caused by HPV types 31, 33, 45, 52, 58 (7 cases in the group that received GARDASIL 9 vs. 222 cases in the group that received GARDASIL ) percent efficacy (95% CI; 65.7, 96.0) against definitive therapy related to HPV types 31, 33, 45, 52, 58 (4 cases in the group that received GARDASIL 9 vs. 32 cases in the group that received GARDASIL ).

4 - 4 - Effectiveness of GARDASIL 9 against persistent infection and disease related to HPV types 6, 11, 16, or 18 was inferred from non-inferiority comparisons of geometric mean titers (GMTs) in 16- through 26-year-old girls and women following vaccination with GARDASIL 9 with those following vaccination with GARDASIL [Quadrivalent Human Papillomavirus (Types 6, 11, 16, 18) Recombinant Vaccine]. Antibody responses for HPV 6, 11, 16, and 18 (measured by GMTs and seroconversion rates at Month 7) for GARDASIL 9 among young women 16 to 26 years of age were non-inferior to those who received GARDASIL. At least 99.7 percent of individuals included in the analysis for each HPV type became seropositive by Month 7. Immunogenicity of GARDASIL 9 (Human Papillomavirus 9-valent Vaccine, Recombinant) Prior vaccination strategies have shown that the ideal time to administer a vaccine is before exposure to the infection. Immunogenicity studies for GARDASIL 9 were used for the adolescent population (9- to 15-year-old girls and boys) because adolescents are not likely to have been exposed to genital HPV types. Immunogenicity studies for GARDASIL 9 in adolescents (9- to 15-year-olds) are similar to that previously established and used in the clinical program for GARDASIL as a basis for licensure in this population. Merck conducted two immunogenicity studies to support effectiveness of GARDASIL 9 in adolescents. In Study 2, effectiveness of GARDASIL 9 against persistent infection and disease related to vaccine HPV types in 9- through 15-year-old girls and boys was inferred from non-inferiority comparison of GMTs following vaccination with GARDASIL 9 among 9- to 15- year-old girls and boys with those among 16- through 26-year-old girls and women. The primary analyses were conducted in the per-protocol population, which included individuals who received all three vaccinations within one year of enrollment, did not have major deviations from the study protocol, and were HPV-naïve (seronegative to the relevant HPV type(s) prior to dose 1 and among female subjects 16 through 26 years of age, PCR negative to the relevant HPV type(s) prior to dose 1 through Month 7). In this study, anti-hpv GMTs at Month 7 for GARDASIL 9 among 9- through 15-year-old girls and boys were non-inferior to anti-hpv GMTs among 16- through 26-year-old women for all nine HPV types. In Study 3, effectiveness of GARDASIL 9 against persistent infection and disease related to HPV types 6, 11, 16, or 18 was inferred from non-inferiority comparisons of GMTs in 9- through 15-year-old girls following vaccination with GARDASIL 9 with those following vaccination with GARDASIL [Quadrivalent Human Papillomavirus (Types 6, 11, 16, 18) Recombinant Vaccine]. In the per-protocol population, anti-hpv 6, 11, 16, and 18 GMTs at Month 7 for GARDASIL 9 among girls 9 through 15 years of age were non-inferior to those

5 - 5 - who received GARDASIL. At least 99.7 percent of individuals included in the analyses for each HPV type became seropositive by Month 7. Across all clinical trials with GARDASIL 9, at least 99.5 percent of individuals included in the analyses for each of the nine vaccine HPV types became seropositive by Month 7. Anti-HPV GMTs at Month 7 among 9- through 15-year-old girls and boys were comparable to anti-hpv responses among 16- through 26-year-old women in the combined database of immunogenicity studies for GARDASIL 9. Safety of GARDASIL 9 (Human Papillomavirus 9-valent Vaccine, Recombinant) The safety of GARDASIL 9 was evaluated in six clinical studies that included more than 13,000 individuals. In clinical studies with GARDASIL 9: The most common ( 10%) local and systemic adverse reactions in females 16 through 26 years of age were injection-site pain (89.9%), injection-site swelling (40.0%), injection-site erythema (34.0%) and headache (14.6%). The most common ( 10%) local and systemic reactions in girls 9 through 15 years of age were injection-site pain (89.3%) injection-site swelling (47.8%), injection-site erythema (34.1%) and headache (11.4%). The most common ( 10%) local and systemic reactions in boys 9 through 15 years of age were injection-site pain (70.2%), injection-site swelling (26.0%), and injectionsite erythema (24.2%). Important Information about GARDASIL 9 (Human Papillomavirus 9-valent Vaccine, Recombinant) GARDASIL 9 is contraindicated in individuals with hypersensitivity, including after a previous dose of GARDASIL 9 or GARDASIL [Quadrivalent Human Papillomavirus (Types 6, 11, 16, 18) Recombinant Vaccine]. Syncope (fainting) may follow any vaccination, especially in adolescents and young adults. Syncope, sometimes associated with falling, has occurred after HPV vaccination. Therefore, vaccinees should be carefully observed for approximately 15 minutes after administration of GARDASIL 9. GARDASIL 9 does not eliminate the necessity for women to continue to undergo recommended cervical cancer screening. Recipients of GARDASIL 9 should not discontinue anal cancer screening if it has been recommended by a health care provider. GARDASIL 9 has not been demonstrated to provide protection against disease from vaccine HPV types to which a person has previously been exposed through sexual activity.

6 - 6 - GARDASIL 9 has not been demonstrated to protect against diseases due to HPV types other than 6, 11, 16, 18, 31, 33, 45, 52, and 58. GARDASIL 9 is not a treatment for external genital lesions; cervical, vulvar, vaginal, and anal cancers; CIN; VIN; VaIN; or AIN. Not all vulvar, vaginal, and anal cancers are caused by HPV, and GARDASIL 9 protects only against those vulvar, vaginal, and anal cancers caused by HPV 16, 18, 31, 33, 45, 52 and 58. Vaccination with GARDASIL 9 may not result in protection in all vaccine recipients. Dosage and administration for GARDASIL 9 (Human Papillomavirus 9-valent Vaccine, Recombinant) GARDASIL 9 should be administered intramuscularly in the deltoid region of the upper arm or in the higher anterolateral area of the thigh at the following schedule: 0, 2 months, 6 months. About HPV and related cancers and diseases Human papillomavirus (HPV) causes virtually all cervical cancer cases. HPV also causes approximately 74 percent of vaginal cancer cases and approximately 25 percent of vulvar cancer cases in females, and approximately percent of anal cancers and genital warts in both females and males. Approximately 575,000 cases of these HPV-related cancers occur annually worldwide. Millions of cases of genital warts occur worldwide each year in females and males. Anal cancer and genital warts affect both men and women. There is no routine screening recommended for the general population to reduce the risk of anal cancer. Treatment of genital warts can be painful, and they commonly recur after treatment, especially in the first three months. About Merck Today's Merck is a global healthcare leader working to help the world be well. Merck is known as MSD outside Canada and the United States. Through our prescription medicines, vaccines, biologic therapies, and consumer care and animal health products, we work with customers and operate in more than 140 countries to deliver innovative health solutions. We also demonstrate our commitment to increasing access to healthcare through far-reaching

7 - 7 - policies, programs and partnerships. For more information about our operations in Canada, visit Forward-Looking Statement This news release includes forward-looking statements within the meaning of the safe harbor provisions of the United States Private Securities Litigation Reform Act of These statements are based upon the current beliefs and expectations of Merck s management and are subject to significant risks and uncertainties. There can be no guarantees with respect to pipeline products that the products will receive the necessary regulatory approvals or that they will prove to be commercially successful. If underlying assumptions prove inaccurate or risks or uncertainties materialize, actual results may differ materially from those set forth in the forwardlooking statements. Risks and uncertainties include but are not limited to, general industry conditions and competition; general economic factors, including interest rate and currency exchange rate fluctuations; the impact of pharmaceutical industry regulation and health care legislation in the United States and internationally; global trends toward health care cost containment; technological advances, new products and patents attained by competitors; challenges inherent in new product development, including obtaining regulatory approval; Merck s ability to accurately predict future market conditions; manufacturing difficulties or delays; financial instability of international economies and sovereign risk; dependence on the effectiveness of Merck s patents and other protections for innovative products; and the exposure to litigation, including patent litigation, and/or regulatory actions. Merck undertakes no obligation to publicly update any forward-looking statement, whether as a result of new information, future events or otherwise. Additional factors that could cause results to differ materially from those described in the forward-looking statements can be found in Merck s 2014 Annual Report on Form 10-K and the company s other filings with the Securities and Exchange Commission (SEC) available at the SEC s Internet site ( Please consult GARDASIL 9 Product Monograph at GARDASIL 9 Consumer Information is also available at # # #